tr (translate characters) in Linux CLI - Mini Project: Build & Apply

Translate Characters Using tr Command

📖 Scenario: You work in a small office where you often receive text files with inconsistent letter cases. Your task is to create a simple script that converts all lowercase letters to uppercase letters to make the text uniform.

🎯 Goal: Build a script that uses the tr command to translate all lowercase letters in a given string to uppercase letters.

📋 What You'll Learn

Use the tr command to translate characters

Translate all lowercase letters to uppercase

Use echo to provide input text

Display the translated output

💡 Why This Matters

🌍 Real World

Translating text case is common when cleaning data or preparing text files for consistent formatting.

💼 Career

Many automation and scripting tasks require text manipulation using commands like <code>tr</code> to standardize input data.

1

Create a variable with lowercase text

Create a variable called text and assign it the value "hello world".

Linux CLI

# Create a variable called text with the value "hello world"
# Your code here

Need a hint?

Use text="hello world" to create the variable.

2

Create a variable with uppercase letters

Create a variable called uppercase_letters and assign it the value "A-Z".

Linux CLI

text="hello world"
# Create a variable called uppercase_letters with the value "A-Z"
# Your code here

Need a hint?

Use uppercase_letters="A-Z" to create the variable.

3

Translate lowercase letters to uppercase using tr

Use the echo command with the variable text and pipe it to tr to translate all lowercase letters a-z to uppercase letters using the variable uppercase_letters. Store the result in a variable called result.

Linux CLI

text="hello world"
uppercase_letters="A-Z"
# Use echo and tr to translate lowercase a-z to uppercase using uppercase_letters variable
# Store the output in result
# Your code here

Need a hint?

Use result=$(echo "$text" | tr 'a-z' "$uppercase_letters") to translate and store the output.

4

Display the translated text

Print the variable result to display the translated uppercase text.

Linux CLI

text="hello world"
uppercase_letters="A-Z"
result=$(echo "$text" | tr 'a-z' "$uppercase_letters")
# Print the result variable
# Your code here

Need a hint?

Use echo "$result" to print the translated text.